Electrospun polyimide ultrafine non-woven fabrics with high whiteness and good thermal stability from organo-soluble semi-alicyclic polyimides: Preparation and properties

eXPRESS Polymer Letters

C. Y. Guo¹ 

关键词: thermal properties;    polyimide;    electrospinning;    whiteness;    solubility;   

DOI  :  10.3144/expresspolymlett.2019.61

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

A series of organo-soluble polyimide (PI) resins were synthesized by a two-step chemical imidization reactionfrom two semi-alicyclic dianhydrides, 1,4-dihydroxyphenyl-dicyclohexanecarboxylate-3,3′,4,4′-tetracarboxylic acid dianhydride(HTA-HQ, I) and 4,4′-dihydroxybiphenyl dicyclohexanecarboxylate-3,3′,4,4′-tetracarboxylic acid dianhydride (HTABP,II) and two rigid-rod aromatic diamines, 2,2′-dimethylbenzidine (DMBZ, a) and 2,2′-bis(trifluoromethyl)benzidine(TFMB, b), respectively. Then, PI ultrafine non-woven fabrics were successfully fabricated via a one-step electrospinningprocedure with the synthesized semi-alicyclic PI resins dissolved in N,N-dimethylacetamide (DMAc), followed by heattreatment at 200 °C. Comparatively, the standard wholly aromatic PI fabric, poly(pyromellitic dianhydride-oxydianiline)(PI-ref, PMDA/ODA) was prepared by a two-step electrospinning procedure with poly(amic acid) (PAA), followed by thehigh-temperature imidization procedure up to 350 °C. The derived electrospun semi-alicyclic PI non-woven fabrics exhibitedmuch higher optical reflectance and whiteness than that of the PI-ref. For example, PI-IIb (HTA-BP/TFMB) fabric showedan optical reflectance (R457) value of 90.6% at the wavelength of 457 nm and whiteness index (WI) of 92.7, which werequite higher than those of PI-ref (R457: 37.3%; WI: 59.0). In addition, the semi-alicyclic PI fabrics exhibited good thermalstability with the glass transition temperatures (Tg) higher than 217°C.

【 授权许可】

CC BY